Massacre for Fortunes

Cast this spell only during combat.
Choose one —
• Whenever an attacking or blocking red creature dies
this turn, discard a card. If you do, draw two cards.
• Whenever an attacking or blocking white creature
dies this turn, sacrifice a land. If you do, put target card
from your graveyard on the top of your library.
Entwine {r}{w} (Choose both if you pay the entwine cost)